Lawn-mower sharpener



C. S. SWAIM AND C. CORUM.

LAWN MOWER SHARPENER. APPLICATION FILED SEPT. 15, 1920.

1,405,561. Patented Feb. 7, 1922.

2 SHEETS-SHEET 1.

El wuewtoz 0/54/5255 6. 5mm

1107 GEM/770N088 (/2! C. S. SWAIM AND C. CORUM.

LAWN MOWER SHARPENER. APPLICATION FILED SEPT. 15. 1920.

Patented Feb. 7, 1922.

2 SHEETS-SHEET 2.

Squawk: Malawi imam flND 6212mm (35m UNITED STATES PATENT OFFICE.

7 CHARLES s. Swami Ann CLINTOKCORUM, or none BEACH, cauromv'm. I

LAWN-MOWER SHARPENER.

To all whom it may concern:

Be it known that we, CHARLES S. Swarm and CLINTON CORUM, citizens of the United .States, residing at'Long Beach, in the county of Los Angeles-and State of-California, have invented certain, new and useful Improve- :mentsin Lawn-Mower Sharpeners, .of which the-following is a specification, reference beone blade of the cutting drum of. a lawn mower andla guiding medium adapted to engage asecond blade of the lawn mower thereby assuring. proper relative positioning of the abrasive medium and the blade being sharpened.

Ar further object of the invention to provide a device ofthe described character wherein the guiding n1edium;.engages the blade with WlllOhlt coactsadjacent the cutting: edge thereof, the guiding medium be ing so constructed that no actual :contact is made with the cuttingedgethereby,preventingdulling thereof, r

A still f rther object of the? invention is to provide a deviceof this characterv which when shifted longitudinally of' the cutting .drum automatically rotates the drum through the guiding medium to cause a spiral blade to assume thesame relative position with respect to the axis of the drum throughout its length, thereby enabling sharpening of the blades of the lawn mower by astraight line reciprocatory motion of the blade sharpener.

Other objects and advantages of the invention will become apparent throughout the course of the following description.

In the accompanying drawings, wherein forthe purpose of illustration, is shown a preferred embodiment of our invention, and wherein like reference characters designate like parts throughout:

Fig. 1 is a side elevation of a lawn mower sharpener constructed according to our invention. V

Fig. 2 is a plan view thereof. I

' Specification of l 'ietters latent.

Patented Feb. 7, 192 2.

Application filed September 15, 1920., Serial No. 410,531.

Fig.3isa section taken on the line 3-3 I of Figure 2. ,Eig. 4: is a perspe ber detached. a j

Fig. 5 is a section on the line.5-5 of Figure 1, and

tive Eof the guide memvice in position upon the .drum of alawn mower for sharpening the blades thereof.

Referringnowmore particularly to the drawings, the numeral 10 indicates a bar provided approximately centrally thereof with a bend 11 and adjacent such bend with a reverse bend 12 oflessinagnitude than the bend 11, whereby the bar is provided with ends at a slight angle withoneanother and a central portion at an angle to each' of said ends.

Mounted upon such central portion is a yoke 13 substantially U-shaped and embodyingat the ends of its arms outstanding portions 13 provided with downwardlyiextending guides 1 adapted to receive therebetween a section of an abrasive medium 15. A screw S extends through an openingO formed in the yoke13 and has threaded engagementwitli the'lbar 10 through which extends andjengages with its lower end as at the abrasive medium 15. It will be. seen. that by adjusting the screw S the abrasive' medium may be loosened or tight-' ened wit'hin the abrasive guides .14. y

. Securedto the end of the bar remote from the bend 11 with respect to the yoke 13 is an adjustableyoke 16 consisting of'astrap extending about the barand securedthereto in adjusted position by tightening the strap through the medium of an adjusting bolt 17. The adjustable yoke 16 has extending upwardly V therefrom an; car :18 through which extends abolt 19, this bolt. likewise extendingthrough an arcuate slot 20. formed in an arcuate arm 21. The bolt is provided with a washer 21 and clamping nut 22. It will beseen that the arcuate arm 21 may be rotated with respect to the bolt 19 and may be likewise longitudinally ad-' j'usted throughout action of the slot 20 with the bolt 19 and may be secured in such adjusted position.

The arcuate arm 21 is provided upon its lower end with a transversely disposed angular foot 23, to which is secured a guid- Fig. 6. 1s a side elevation showing our .de-

ing member 2 having the face adjacent the abrasive element 15 bifurcated to form we claim is:

arms 25 and 26. An inspection of the drawing will reveal the fact that the abrasive element 15 and the guide 24 are substantially arallel and are angularly disposed with reation to the bar 10. This angle isvprovided to compensate for the angularityof the spiral blades of the cutting drum of the lawn mower;

In the operation of our device the abrasive element 15 is properly positioned upon one of the blades27 of the cuttin drum so that it flatly engages the ground ace there of. The arm 21 is then properly adjusted so that the arm 26 of the guide 24engages the forward face of the next adjacent blade- 28 of the cutting drum and the arm 25 enages the ground surface. It will be noted t at the arms 25 and 26 are so formed that when they are in such engaged position the cutting ed e proper of the blade is not in contactwit any part thereof, thereby preventing the dulling of such cutting edge.

When the-arm 21 has been so adjusted it is merely necessar to reciprocate the bar longitudinally of t e cutting drum of the lawn mower, the engagement of the guide 241 with the'blade 28 substantially rotating the drum to properly position the blade 27 for engagement with the abrasive element 15. This abrasive element may be constructed of any desired material, preferably of metal, as a file,'or of carborundum.

t It will be obvious that our device, by. reason of its simplicity and efiiciency in operation is particularly well adapted for the use for which it is intended, and it will likewise be obvious that the construction thereof is susceptible to some chan e without in any "manner de arting from t e spirit of our in- 40' vention. e accordingly do not limit ourselves to such construction except as so limited by the subjoined claims.

Having now described our invention, what 1. In a lawn mower sharpener, a supporting member, an abrasive element carried by sald member and adapted to engage one blade of the cutting drum of the lawn mower, and a guide carried by said supporting member and adapted to engage a second blade of the cutting drum. 7

'2. In a lawn mower sharpener, a bar, a

yoke mounted upon the bar and including guides, an abrasive element mounted within the guides, identical means for securing said abrasive element within the guides and securing said yoke upon the bar, said abrasive element being adapted to engage one blade of the cutting drumof the lawn mowerv and a guide carried by said bar and adapted to engage a second blade of the cutting drum.

3. In a lawn mower sharpener, a bar, a yoke mounted upon the bar and including guides, an abrasive element mounted within the guides, identical means for securing said abrasive element within the guides and securing said yoke upon the bar, said abrasive element being adapted to engage one blade of the cutting drum of the lawn mower and a guide carried by said bar and adapted to engage a second blade of the cutting drum, said guide being longitudinally adjustable upon said bar.

4. In a device of the type described a bar, an abrasive element carried by the bar intermediate the ends thereof, a yoke adjustably mounted upon the bar, an arcuate arm carried by said yoke and rotatably and longitudinally adjustable thereon and a guide carried by said arcuate arm, said abrasive element being adapted to engage oneblade of the cutting said guide bemg adapted to engage the next adjacent blade of the cutting drum.

5. In a device of the type described a bar, an abrasive element carried by the bar indrum of a lawn mower and termediate the ends thereof, a yoke adjustably mounted upon the bar, an arcuate arm carried by said yoke and rotatably and lon-r gitudinally adjustable thereon and a guide carried by said arcuate arm, said abrasive element being adapted to engage one blade of the cutting drum of a lawn mower and said guide belng adapted to engage the next adjacent blade ofthe cutting drum, said guide embodying spaced arms adapted to receive therebetween the cutting edge of the blade engaged thereby, the ends of said arm engaging the adjacent faces of the blade.

In testimony whereof we hereunto afiix our signatures.

CHARLES S. SWAIM. CLINTON CORUM. 

